I have the same problem then Stefen Groth and I modify the MessengerName with prefix "GLOBAL\" on server and "SESSION\1\" on the client but now the error is:
"creation of memory mapping access mutex failed" what's happen?

Either it's a permissions problem or your application doesn't run in session 1 (this can happen if you are in terminal environment). Assuming that the problem happens for you in Delphi, you can try to debug the source code to get the eact reason. Find this error message in MCMMF.pas and put a breakpoint there. Then expect the error code that causes the message and the exception to appear.

Please try running the same code on some other computer and let me know the result. It is also possible that on VMWare session numbers for whatever reason are offset, so SESSION\2\ can be required. I can only guess at this point :(.

Very interesting. Thank you very much for posting - I was not careful enough to check casing (I believed the names are case-insensitive, as it happens with object names in NT, but this is not so with prefixes, as it turns out).

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